Grave golems serve as the bossmercanaries on Cursed Hollow and Blackheart's Bay. The Blackheart's Bay version is covered in seaweed and barnacles, but is otherwise identical. They first spawn after 5:00 minutes into the game and respawn after 5:00 minutes.

Those large, tanky and high damage bosses can easily push through enemy minions and structures. The Grave Golem will periodically pause to cast either its Binding Roots or Smash spell. If two or more enemies are within melee range, the Grave Golem will pause to cast its smash spell, winding up for 3 seconds before crashing down for large damage that is doubled versus structures, minions, and summons, in addition to stunning any enemies hit for 2 seconds. This Smash spell has an 10 second cooldown. Alternatively, the Golem will cast Binding Roots, preferring to center the spell on an enemy hero. The roots have a 3 second delay before rooting any enemies in the area for 3 seconds and dealing heavy damage on a 15-second cooldown. The Grave Golem has a 5 second global cooldown that prevents it from using the stomp and roots too close together, although the delay and the duration of the roots do allow the Grave Golem to effectively guarantee its stomp on a hero that gets rooted too close.

In terms of its ability to effectively destroy enemy structures, the Grave Golem is technically capable of soloing the core (including shields) at any point in the game. However, this effect is moderated by the damage the Grave Golem takes from minions, requiring it to pause and use its Stomp, and by the damage dealt by heroes to the Grave Golem. As an example, a 15:00 Grave Golem can solo the core with about a third of its health left.[1]

They are very dangerous to take, and their spawn location is known as "the throw pit", so only attack them when you have a level advantage or some opposing heroes are dead in order to make sure it will not be stolen from you.

The Sand Golem found on Sky Temple and Tomb of the Spider Queen is almost exactly like the Grave Golem, however it also periodically spawns a whirlwind(s) that pushes heroes out of the way/prevents them from walking through that area.

Grave Golems drop Cursed Skulls when killed. Collecting Cursed Skulls empower your team's Bone Golem, with the team with the highest amount of Cursed Skulls, out of 100 available, having a stronger one. The Bone Golem, once resurrected, will walk down the lane smashing buildings and enemies until its defeated.

The Bone Golem (also called Summoned Golem or Grave Golem) is a monster which can be summoned on the Haunted Mines.

The power of the Bone Golem scales with the number of Cursed Skulls you bring in from killing the Undead Army and the Grave Golem in the underground portion of the battleground. Collecting Cursed Skulls empower your team's Bone Golem, with the team with the highest amount of Cursed Skulls, out of 100 available, having a stronger one. The Bone Golem will arise for both teams: One golem in the top lane and the other at the bottom. The initial Golem spawn is random. Subsequent Golem spawns swap lanes from the previous one. Once resurrected, will walk down the lane smashing buildings and enemies until its defeated.

The Bone Golems power increases with both time passed, and number of skulls collected.

The Golem's HP and damage scales by time and by skulls collected: Each Golem gets skull stacks based on the skulls you collected — each skull stack grants bonuses to HP and damage, applied after the time-based scaling.

Skull gains have mildly dimishing returns. The first ~50 skulls are all about equally valuable, but past that point they start contributing a little less.

The Golems scaling by time is marked at 60 skulls in total acquired, so collecting more skulls can still make it stronger, but waiting will not.

HP and damage are individually linear scaling with the number of skulls acquired, but because more HP means the golem can get more swings in, skull collection overall has a quadratic effect on how powerful the golem is.

Once 25 minutes have passed in-game, golems will no longer get stronger over time at all - their time scaling is capped.

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